Bug reports is read-only for me so I’ll post this here.
Currently in the latest patch 1.20.12, you can’t progress or complete a treasure chart. It would still yield the chests and potential rewards from digging up all treasure (e.g artic crystals), but the chart won’t be consumed nor progress to the next spot, as well as not rewarding the player with guild/clan points.
This was also tested in a different 1.20.12 server.
As you can see the standard 4 artic crystals from digging up all chests in a frozen biome which indicates that a chart should’ve been completed, but it wasn’t.
What’s absurd to me is, there was no change specifically stated to be related to charts. It’s like the mechanic just decided not to clock into work this patch (which is never the case).